lkml.org 
[lkml]   [2020]   [Mar]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH v3 tip/core/rcu 34/34] rcu-tasks: Add IPI failure count to statistics
    Date
    From: "Paul E. McKenney" <paulmck@kernel.org>

    This commit adds a failure-return count for smp_call_function_single(),
    and adds this to the console messages for rcutorture writer stalls and at
    the end of rcutorture testing.

    Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
    ---
    kernel/rcu/tasks.h | 11 +++++++----
    1 file changed, 7 insertions(+), 4 deletions(-)

    diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
    index 06fe0c4..9c65e78 100644
    --- a/kernel/rcu/tasks.h
    +++ b/kernel/rcu/tasks.h
    @@ -32,6 +32,7 @@ typedef void (*postgp_func_t)(struct rcu_tasks *rtp);
    * @gp_start: Most recent grace-period start in jiffies.
    * @n_gps: Number of grace periods completed since boot.
    * @n_ipis: Number of IPIs sent to encourage grace periods to end.
    + * @n_ipis_fails: Number of IPI-send failures.
    * @pregp_func: This flavor's pre-grace-period function (optional).
    * @pertask_func: This flavor's per-task scan function (optional).
    * @postscan_func: This flavor's post-task scan function (optional).
    @@ -51,6 +52,7 @@ struct rcu_tasks {
    unsigned long gp_start;
    unsigned long n_gps;
    unsigned long n_ipis;
    + unsigned long n_ipis_fails;
    struct task_struct *kthread_ptr;
    rcu_tasks_gp_func_t gp_func;
    pregp_func_t pregp_func;
    @@ -290,12 +292,12 @@ static void __init rcu_tasks_bootup_oddness(void)
    /* Dump out rcutorture-relevant state common to all RCU-tasks flavors. */
    static void show_rcu_tasks_generic_gp_kthread(struct rcu_tasks *rtp, char *s)
    {
    - pr_info("%s: %s(%d) since %lu g:%lu i:%lu %c%c %s\n",
    + pr_info("%s: %s(%d) since %lu g:%lu i:%lu/%lu %c%c %s\n",
    rtp->kname,
    - tasks_gp_state_getname(rtp),
    - data_race(rtp->gp_state),
    + tasks_gp_state_getname(rtp), data_race(rtp->gp_state),
    jiffies - data_race(rtp->gp_jiffies),
    - data_race(rtp->n_gps), data_race(rtp->n_ipis),
    + data_race(rtp->n_gps),
    + data_race(rtp->n_ipis_fails), data_race(rtp->n_ipis),
    ".k"[!!data_race(rtp->kthread_ptr)],
    ".C"[!!data_race(rtp->cbs_head)],
    s);
    @@ -905,6 +907,7 @@ static void trc_wait_for_one_reader(struct task_struct *t,
    trc_read_check_handler, t, 0)) {
    // Just in case there is some other reason for
    // failure than the target CPU being offline.
    + rcu_tasks_trace.n_ipis_fails++;
    per_cpu(trc_ipi_to_cpu, cpu) = false;
    t->trc_ipi_to_cpu = cpu;
    if (atomic_dec_and_test(&trc_n_readers_need_end)) {
    --
    2.9.5
    \
     
     \ /
      Last update: 2020-03-27 23:42    [W:5.868 / U:0.024 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site